A network-side device and a macro base station to micro base station switching method relate to a universal mobile telecommunications system. The method includes: multiplexing part of scrambling codes in reserved scrambling codes to micro base station cells, and configuring them to a user equipment; a network side creating a SNF−SFN relation list between various base station cells according to existing determined neighbor cell relations and cell synchronization information in a measurement report by the user equipment; when the user equipment reports a switching measurement report of a target cell, the network side determining a target cell in actual switching and performing the switching according to the scrambling code information in the switching measurement report, TM and OFF information in the cell synchronization information and the SFN−SFN relation list. The embodiment of the present invention further discloses a network-side device.
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2. The method of claim 1 , wherein the network side configures the scrambling code information multiplexed by various micro base station cells to the user equipment when filling in a neighbor cell measurement control.
In a UMTS network, the network controller configures the user equipment (UE) with the scrambling code information used by the micro base stations when creating the neighbor cell measurement control information. This allows the UE to identify and measure signals from the micro base stations, even if they use overlapping scrambling codes, to enable seamless handovers. The neighbor cell measurement control tells the UE which cells to monitor for handover purposes.
3. The method of claim 2 , wherein the network side creating a SFN−SFN relation list between macro base stations and micro base station cells in accordance with the existing determined neighbor cell relations and the cell synchronization information in the measurement report reported by the user equipment refers to: the network side creating and updating the SFN−SFN relation list between the macro base stations and the micro base station cells in accordance with determined neighbor cell relations between cells and the TM and OFF information in target cell synchronization information in the measurement report reported by the user equipment.
In a UMTS network, the network controller creates and updates a SFN-SFN (System Frame Number) relation list between macro base stations and micro base station cells. This list is built using existing neighbor cell relationships and timing information (TM/OFF: Timing Measurement/Offset) from the UE's measurement reports. The UE provides cell synchronization information of target cells in its reports. This allows the network to accurately determine the time difference between cells for handover decisions, even when cells are asynchronous.
4. The method of claim 1 , wherein the network side creating a SFN−SFN relation list between macro base stations and micro base station cells in accordance with the existing determined neighbor cell relations and the cell synchronization information in the measurement report reported by the user equipment refers to: the network side creating and updating the SFN−SFN relation list between the macro base stations and the micro base station cells in accordance with determined neighbor cell relations between cells and the TM and OFF information in target cell synchronization information in the measurement report reported by the user equipment.
In a UMTS network, the network controller creates and updates a SFN-SFN (System Frame Number) relation list between macro base stations and micro base station cells. This list is built using existing neighbor cell relationships and timing information (TM/OFF: Timing Measurement/Offset) from the UE's measurement reports. The UE provides cell synchronization information of target cells in its reports. This allows the network to accurately determine the time difference between cells for handover decisions, even when cells are asynchronous.
6. The method of claim 1 , wherein the method further comprises: after composing cells corresponding to a value of scrambling code into a cell list according to the value of scrambling code in the measurement report reported by the user equipment, the network side calculating relative distances according to cell position information of a existing network and removing cells which do not meet a relative distance condition from the cell list, and then calculating SFN time difference between the source cell Cell 2 and remaining cells in the cell list.
In a UMTS network, after receiving a measurement report from the UE containing scrambling code information, the network controller creates a list of cells corresponding to those scrambling codes. It then uses cell position information to calculate relative distances between cells, removing cells that are too far away. Finally, the system calculates the SFN time difference between the serving cell (Cell 2) and the remaining cells in the list. This reduces the number of potential target cells and focuses handover attempts on geographically relevant options, improving efficiency.
7. The method of claim 1 , wherein when calculating the SFN−SFN difference between the target cell and the source cell according to the values of TM and OFF of the target cell of the switching measurement report reported by the user equipment, if the target cell and the source cell have a direct relation, the SFN difference between the target cell and the source cell saved in the SFN−SFN list is directly taken; if the target cell and the source cell do not have a direct relation, the SFN difference between the target cell and the source cell is calculated according to a shortest path method in a network topology.
In a UMTS network, when calculating the SFN-SFN difference between a target cell and the serving cell based on the UE's measurement report (TM/OFF values), the network controller first checks if a direct relationship exists in the pre-calculated SFN-SFN list. If a direct relationship is found, the pre-calculated SFN difference is used. If no direct relationship exists, the SFN difference is calculated using a shortest path algorithm across the network topology. This optimizes handover timing by leveraging pre-computed values when available and using a network-aware calculation when needed.
8. The method of claim 1 , wherein the number of the scrambling codes and the scrambling codes multiplexed to various micro base station cells are different.
In a UMTS network where scrambling codes are multiplexed in micro base stations, the number of scrambling codes allocated to each micro base station cell can vary. Also, the set of scrambling codes assigned to each micro base station can be different. This allows for flexible and efficient allocation of scrambling codes based on the specific needs of each micro base station, optimizing capacity.
9. The method of claim 1 , wherein the number of the scrambling codes multiplexed to the micro base station cells is greater than 31.
In a UMTS network where scrambling codes are multiplexed in micro base stations, the number of scrambling codes used for the micro base station cells is greater than 31. This increases the capacity of the micro base station layer.
11. The network-side device of claim 10 , wherein the first module is configured to: configure scrambling code information multiplexed by various micro base station cells to the user equipment when filling in a neighbor cell measurement control.
In a UMTS network device, the "first module" is configured to send the scrambling code information that is multiplexed by the micro base stations to the user equipment (UE) as part of the neighbor cell measurement control information. This allows the UE to identify and measure signals from the micro base stations, even if they use overlapping scrambling codes, to enable seamless handovers.
12. The network-side device of claim 11 , wherein the second module being configured to create a SFN−SFN relation list between macro base stations and micro base station cells in accordance with the existing determined neighbor cell relations and the cell synchronization information in the measurement report reported by the user equipment refers to: the second module creating and updating the SFN−SFN relation list between the macro base stations and the micro base station cells in accordance with determined neighbor cell relations between cells and TM and OFF information in target cell synchronization information in the measurement report reported by the user equipment.
In a UMTS network device, the "second module" creates and updates a SFN-SFN (System Frame Number) relation list between macro base stations and micro base station cells. This list is built using existing neighbor cell relationships and timing information (TM/OFF: Timing Measurement/Offset) from the UE's measurement reports. The UE provides cell synchronization information of target cells in its reports. This allows the network to accurately determine the time difference between cells for handover decisions, even when cells are asynchronous.
13. The network-side device of claim 10 , wherein the second module being configured to create a SFN−SFN relation list between macro base stations and micro base station cells in accordance with the existing determined neighbor cell relations and the cell synchronization information in the measurement report reported by the user equipment refers to: the second module creating and updating the SFN−SFN relation list between the macro base stations and the micro base station cells in accordance with determined neighbor cell relations between cells and TM and OFF information in target cell synchronization information in the measurement report reported by the user equipment.
In a UMTS network device, the "second module" creates and updates a SFN-SFN (System Frame Number) relation list between macro base stations and micro base station cells. This list is built using existing neighbor cell relationships and timing information (TM/OFF: Timing Measurement/Offset) from the UE's measurement reports. The UE provides cell synchronization information of target cells in its reports. This allows the network to accurately determine the time difference between cells for handover decisions, even when cells are asynchronous.
15. The network-side device of claim 10 , wherein the third module is further configured to: after composing the cells corresponding to the value of scrambling code into the cell list according to the value of scrambling code in the measurement report reported by the user equipment, calculate relative distances according to cell position information in a existing network and remove cells which do not meet a relative distance condition from the cell list, and then calculate a SFN time difference between the source cell Cell 2 and remaining cells in the cell list.
In a UMTS network device, after the UE sends a measurement report with scrambling code information, the "third module" creates a list of cells associated with these scrambling codes. It calculates relative distances using cell position information, removes cells too far away and then determines the SFN time difference between the serving cell (Cell 2) and the remaining nearby cells. This focuses handover attempts on geographically relevant options, improving efficiency.
16. The network-side device of claim 10 , wherein the third module is further configured to, when calculating the SFN−SFN difference between the target cell and the source cell according to the values of TM and OFF of the target cell of the switching measurement report reported by the user equipment, if the target cell and the source cell have a direct relation, directly take the SFN difference between the target cell and the source cell saved in the SFN−SFN list; if the target cell and the source cell do not have a direct relation, calculate the SFN offset between the target cell and the source cell according to a shortest path method in a network topology.
In a UMTS network device, when the "third module" calculates the SFN-SFN difference between a target cell and the serving cell using the UE's measurement report data (TM/OFF values), it first checks if a direct SFN-SFN relationship already exists. If it does, that value is used. If no direct relationship exists, the module calculates the SFN difference using a shortest path algorithm across the known network topology. This speeds up handovers.
17. The network-side device of claim 10 , wherein the number of the scrambling codes and the scrambling codes multiplexed by the first module to various micro base station cells are different.
In a UMTS network device, the "first module," responsible for multiplexing scrambling codes, allows for varying the number of scrambling codes assigned to each micro base station cell and the sets of scrambling codes. This enables flexible and efficient allocation based on specific micro base station needs, optimizing network capacity.
18. The network-side device of claim 10 , wherein the number of the scrambling codes multiplexed by the first module to the micro base station cells is greater than 31.
In a UMTS network device, the "first module" multiplexes more than 31 scrambling codes to micro base station cells. This increases the capacity of the micro base station layer.
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September 16, 2013
June 6, 2017
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